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