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