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