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