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