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)(21,22,26,30,27,31,25,33)(23,32,34,36,35,24,29,28)(5,7)(6,10)(8,15)(9,14)(11,19)(12,18)(13,16)(17,20)(21,23)(22,28)(24,30)(25,34)(26,29)(27,35)(31,36)(32,33) involution — undirected(2,4)(5,8)(6,11)(7,13)(9,16)(10,17)(12,20)(14,15)(18,19)(21,24,27,32)(22,29,31,34)(23,33,35,30)(25,36,26,28)(8,16)(11,20)(13,15)(17,19)(21,22,26,30,27,31,25,33)(23,24,34,28,35,32,29,36)(6,12)(7,14)(11,20)(13,15)(21,25,27,26)(22,30,31,33)(23,29,35,34)(24,28,32,36)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.