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