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