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