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