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