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