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