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