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