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