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