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