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