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