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