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