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