One vertex per element, one color per generator, with an edge from x to x·s.
(2,6)(3,9)(8,13)(10,15)(17,18)(19,29)(20,26)(21,23)(22,27)(24,28)(25,32)(30,31)(34,38)(35,41)(40,43)(42,47) involution — undirected(1,2,5,6)(3,7,9,12)(4,8,11,13)(10,14,15,16)(17,19)(18,25)(20,30)(21,27)(22,26)(23,31)(24,32)(28,29)(33,34,37,38)(35,39,41,45)(36,40,44,43)(42,46,47,48)(1,2)(3,7)(4,8)(5,6)(9,12)(10,14)(11,13)(15,16)(17,20,24,21)(18,26,28,23)(19,30,32,27)(22,29,31,25)(33,35,37,41)(34,39,38,45)(36,42,44,47)(40,46,43,48)(1,2)(3,7)(4,8)(5,6)(9,12)(10,14)(11,13)(15,16)(17,21,24,20)(18,26,28,23)(19,27,32,30)(22,29,31,25)(33,34)(35,39)(36,43)(37,38)(40,44)(41,45)(42,48)(46,47)(1,3,5,9)(2,7,6,12)(4,10,11,15)(8,14,13,16)(17,22,24,31)(18,27,28,30)(19,26,32,23)(20,25,21,29)(33,35)(34,39)(36,42)(37,41)(38,45)(40,46)(43,48)(44,47)(1,4,5,11)(2,8,6,13)(3,10,9,15)(7,14,12,16)(17,23,24,26)(18,21,28,20)(19,31,32,22)(25,27,29,30)(33,36,37,44)(34,40,38,43)(35,42,41,47)(39,46,45,48)A Cayley diagram is a choice, not a fact about the group. Another drawing of this group — in a book, or on a different generating set — may look nothing like this one.