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