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