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