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