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