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