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