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