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