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