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