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