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