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