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