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