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