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