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