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)(15,19)(16,18)(17,20)(23,29)(24,30)(26,32)(28,33)(31,35)(34,36)(6,9)(10,11)(13,15)(14,17)(16,20)(18,19)(21,22)(23,26)(24,28)(25,27)(29,32)(30,33)(31,34)(35,36) involution — undirected(2,4)(15,20)(17,19)(21,23,30,35,25,31,24,29)(22,26,33,36,27,34,28,32)(5,7,8,12)(6,10,9,11)(14,18)(17,19)(22,27)(26,34)(28,33)(32,36)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.