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)(11,14)(12,13)(15,16)(17,18)(19,27)(20,25)(21,23)(22,26)(24,31)(28,38)(29,37)(30,42)(32,45)(33,39)(34,36)(35,41)(40,44)(43,47)(46,48) involution — undirected(1,3,6,2)(4,8,5,7)(18,23)(19,28)(20,32)(22,29)(24,38)(25,41)(27,40)(31,44)(34,35)(36,45)(39,42)(43,46)(10,13)(14,16)(17,19,29,44,21,31,22,28)(18,24,37,38,23,27,26,40)(20,33,32,43,34,30,35,46)(25,42,45,48,36,39,41,47)(1,4,6,5)(2,7,3,8)(9,11,12,15)(10,14,13,16)(18,23)(20,34)(24,27)(26,37)(30,33)(32,35)(38,40)(43,46)(1,5,6,4)(2,7,3,8)(17,20,22,35,21,34,29,32)(18,25,26,41,23,36,37,45)(19,30,28,43,31,33,44,46)(24,39,40,48,27,42,38,47)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.