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