One vertex per element, one color per generator, with an edge from x to x·s.
(1,2)(3,7)(4,12)(5,6)(8,13)(9,10)(11,15)(14,16)(18,23)(19,25)(24,30)(26,31)(33,34)(35,42)(36,44)(37,41)(38,39)(40,45)(43,47)(46,48) involution — undirected(1,2)(3,9)(4,8)(5,6)(7,10)(11,15)(12,13)(14,16)(17,18)(19,20)(21,24)(22,23)(25,27)(26,28)(29,30)(31,32)(33,35,39,41)(34,37,38,42)(36,43,45,48)(40,47,44,46)(2,6)(3,10)(4,13)(14,15)(19,25)(20,27)(21,29)(24,30)(34,38)(36,45)(37,42)(43,48) involution — undirected(1,2)(3,9)(4,8)(5,6)(7,10)(11,15)(12,13)(14,16)(17,19,22,25)(18,20,23,27)(21,26,29,31)(24,28,30,32)(33,36,39,45)(34,40,38,44)(35,43,41,48)(37,47,42,46)(1,3,5,10)(2,7,6,9)(4,11,13,16)(8,14,12,15)(17,20)(18,19)(21,28)(22,27)(23,25)(24,26)(29,32)(30,31)(33,37,39,42)(34,41,38,35)(36,46,45,47)(40,43,44,48)(1,4)(2,8)(3,11)(5,13)(6,12)(7,14)(9,15)(10,16)(17,21,22,29)(18,24,23,30)(19,26,25,31)(20,28,27,32)(33,38,39,34)(35,42,41,37)(36,44,45,40)(43,46,48,47)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.