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