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