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