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