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