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