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