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