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