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