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