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