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