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