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