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