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