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