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