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