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