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