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