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