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