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)(14,18)(15,19)(16,20)(22,27)(23,32)(25,28)(29,34)(30,35)(31,36) involution — undirected(5,7)(6,10)(8,15)(9,14)(11,19)(12,18)(13,16)(17,20)(21,22,28,36,26,31,25,27)(23,29,24,34,32,35,33,30)(2,4)(5,8,9,16)(6,11,12,20)(7,13,14,15)(10,17,18,19)(21,23)(22,29)(24,28)(25,33)(26,32)(27,30)(31,35)(34,36)(7,14)(10,18)(13,15)(17,19)(21,24,26,33)(22,30,31,34)(23,28,32,25)(27,35,36,29)(6,12)(10,18)(11,20)(17,19)(23,32)(24,33)(29,35)(30,34) 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.