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