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