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