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