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