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