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