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