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