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