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