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