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