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