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