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