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