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