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