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