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