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