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